cannot get debug in MS-DOS

I am trying to run debug in cmd as anms-dos input but this is as far as i can get. ie when i hit enter it should move down with a flasing cursor waiting for a command. What could stop this in my computer, is there something missing.



This is what i am trying to run, it is a programme that is found at many sites and it should reset bios instead of removing bios battery.

 

For anybody who has the same problem i have carried out this fix, now debug works OK and certainly saves opening up computer and taking out bios battery.
I looked in my Windows system32 folder and found that the debug.exe was missing, downloaded a copy from web onto a floppy, put it into the system32 folder and bingo it works. Hope this is of help to someone as i could not find this suggestion anywhere on web